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How To Configure Interface Breakout And Aggregation On Dell Z9100 Switches

Time: 2025-08-15
        We previously introduced how to configure interface splitting and aggregation on Dell S5224F switches. Taking the Z9100-ON switch (Software Version: 9.11(0.0P6)) as the test device, this article demonstrates the QSFP interface splitting and aggregation configuration methods for Dell PowerSwitch Z series switches.
        1. By default, the QSFP interfaces work in aggregation mode. When checking interface status, only one independent interface is displayed with a default speed of 100G, and it can also be configured to 40G.
        2. Enter global configuration mode and run the following command:
            stack-unit <stack-unit_number> port <port_number> portmode quad speed <speed>
        This command splits aggregated QSFP interfaces. Supported split modes include single mode, 1-to-2 split, and 1-to-4 split. For 1-to-4 mode, the available speed options are 10G and 25G. After issuing the command, the device needs a restart for the split configuration to take effect.
        Note: If the interface is not restored to factory defaults, run the command below to reset it first:
            default interface <interface_type> <interface_number>
        3. After completing the split configuration, check the interface list. The original single aggregated interface will be divided into four independent 10G logical interfaces.
        4. To disable interface splitting and restore aggregation mode, enter global configuration mode and use the command:
            no stack-unit <stack-unit_number> port <port_number> portmode quad speed <speed>
        Before executing this command, ensure the interface is in the default configuration state. Once completed, the interface will revert to the device’s initial aggregated state.
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